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  • Title: An accelerated method for the detection of extended-spectrum beta-lactamases in urinary isolates of Escherichia coli and Klebsiella pneumoniae.
    Author: Kader AA, Kumar A, Krishna A, Zaman MN.
    Journal: Saudi J Kidney Dis Transpl; 2006 Dec; 17(4):535-9. PubMed ID: 17186689.
    Abstract:
    We prospectively studied an accelerated phenotypic method by incorporating the double disk synergy test in the standard Kirby-Bauer disk diffusion susceptibility testing, to evaluate a protocol for the rapid detection of extended-spectrum beta-lactamases (ESBL) in urinary isolates of Escherichia coli (E. coli) and Klebsiella pneumoniae (K. pneumoniae). All ESBL-positive isolates were confirmed by the standard Clinical Laboratory Standards Institute (CLSI) confirmatory disk diffusion method. Between November 2004 and December 2005, a total of 6988 urine specimens were analyzed of which, 776 (11%) showed significant growth. They included E. coli in 577 cases (74%) and K. pneumoniae in 199 (25.6%). Of these, 63 E. coli (8%) and 15 K. pneumoniae (7.5%) were positive for ESBL by the accelerated and CLSI methods. Compared to the standard CLSI method, the accelerated method reduced the ESBL detection time from two days to one day. We conclude that the accelerated ESBL detection technique used by us in this study is a reliable and rapid method for detecting ESBL in urinary isolates of E. coli and K. pneumoniae.
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